On Wed, Dec 19, 2012 at 3:40 PM, Jacob Shin <jacob.shin@xxxxxxx> wrote: > On Wed, Dec 19, 2012 at 03:22:13PM -0800, H. Peter Anvin wrote: >> The other bit is that building the real kernel page tables iteratively >> (ignoring the early page tables here) is safer, since the real page >> table builder is fully aware of the memory map. This means any >> "spillover" from the early page tables gets minimized to regions where >> there are data objects that have to be accessed early. Since Yinghai >> already had iterative page table building working, I don't see any >> reason to not use that capability. > > Yes, I'll test again with latest, but Yinghai's patchset mapping only > RAM from top down solved our problem. that is for-x86-mm or tip:x86/mm2 we are taking about for-x86-boot, and it will allow kernel to be loaded above 4G to solve the kdump problem. so early map will have two way 1. extend head_64.S to cover kernel instead of just [0, 1G) 2. or peter's #PF handler version patch to set pg table dynamically. it could cover 1G when PF happens. Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html